Remove undocumented APIs getGlobalConfigValue and Element (#195)

* Remove undocumented APIs

* Update CHANGELOG

CHANGELOG.md

@@ -16,6 +16,9 @@
 * `setState` can now be called inside `init` and `willUpdate`. Instead of triggering a new render, it will affect the currently scheduled one. ([#139](https://github.com/Roblox/roact/pull/139))
 * Roll back changes that allowed `setState` to be called inside `willUpdate`, which created state update scenarios with difficult-to-determine behavior. ([#157](https://github.com/Roblox/roact/pull/157))
 * By default, disable the warning for an element changing types during reconciliation ([#168](https://github.com/Roblox/roact/pull/168))
+* Removed some undocumented APIs:
+	* `Roact.getGlobalConfigValue`, which let users read the current internal configuration.
+	* `Roact.Element`, which let users figure out whether something is a Roact element. We'll introduce a proper type-checking API at a later date.
 
 ## 1.0.0 Prerelease 2 (March 22, 2018)
 * Removed `is*Element` methods, this is unlikely to affect anyone ([#50](https://github.com/Roblox/roact/pull/50))

lib/init.lua

@@ -18,7 +18,6 @@ local Roact = {
 	PureComponent = require(script.PureComponent),
 
 	Children = Core.Children,
-	Element = Core.Element,
 	None = Core.None,
 	Portal = Core.Portal,
 	Ref = Core.Ref,
@@ -32,7 +31,6 @@ local Roact = {
 	reconcile = ReconcilerCompat.reconcile,
 
 	setGlobalConfig = GlobalConfig.set,
-	getGlobalConfigValue = GlobalConfig.getValue,
 
 	-- APIs that may change in the future without warning
 	UNSTABLE = {

lib/init.spec.lua

@@ -10,7 +10,6 @@ return function()
 			update = "function",
 			oneChild = "function",
 			setGlobalConfig = "function",
-			getGlobalConfigValue = "function",
 
 			-- These functions are deprecated and throw warnings!
 			reify = "function",
@@ -25,7 +24,6 @@ return function()
 			Change = true,
 			Ref = true,
 			None = true,
-			Element = true,
 			UNSTABLE = true,
 		}